Senior Frontend Developer

**Czym będziesz się zajmować?** ### Requirements: * Minimum 5 years of experience in creating web applications using React, * Minimum 3 years of experience in creating mobile applications using React Native, * Excellent knowledge of JavaScript (ES6+), HTML5, and CSS3, * Experience with Redux or other state management tools, * Familiarity with CI/CD tools and experience working with version control systems (Git), * Ability to write unit and integration tests (Jest, Enzyme, Testing Library), * Experience with integrating RESTful APIs and GraphQL, * Knowledge of best practices related to frontend application security, * Ability to work in agile methodologies (Agile, Scrum), * Very good communication and interpersonal skills, * Fluent in English (minimum B2 level). ### Additional advantages: * Experience with TypeScript, * Knowledge of other frontend frameworks and libraries (Vue.js, Angular), * Experience in conducting technical training and workshops, * Familiarity with tools for analyzing and monitoring application performance (e.g. Lighthouse, Sentry). **Kogo poszukujemy?** ### Responsibilities: * Designing and implementing advanced user interfaces using React and React Native, * Creating and maintaining reusable components and frontend libraries, * Close collaboration with backend teams, UX/UI designers, and product owners to deliver high-quality solutions, * Optimizing applications for performance and scalability, * Conducting code reviews and mentoring junior team members, * Participating in planning system architecture and technology selection. ### We offer: * Attractive salary and bonus system, * Possibility of remote work and flexible working hours, * Private medical care and life insurance, * Access to the latest technologies and tools, * Budget for training, conferences, and professional development, * Friendly and supportive work atmosphere in an international environment, * Modern offices in convenient locations. **Czego wymagamy?** Znajomości: * CI/CD * RESTful * React * React Native Mile widziane: * TypeScript Języki: * Angielski **Jakie warunki i benefity otrzymasz?** * 20k–24k PLN netto/m (B2B) * B2B - Elastyczne godziny pracy (100%) * Praca zdalna: W całości * Szkolenia wewnętrzne * Kawa / Herbata * Płatny "urlop" dla B2B **Kim jesteśmy?** Our client is a modern, international technology company specializing in creating innovative solutions for the e-commerce and fintech industry, which values creativity, commitment, and teamwork.